During vesicles in the cell fuse with the cell membrane, releasing their contents to the outside.

During exocytosis, vesicles in the cell  fuse with the cell membrane, releasing their contents to the outside. 

It involves the movement of an intra cellular  vesicle  to the plasma membrane, then fusion.

There are many cellular processes that involve exocytosis. These include:

1.release of neurotransmitters from presynaptic neurons

2. secretion of enzymes, peptides hormones and antibodies from cells.

3. Placement of integral membrane proteins

4. Antigen presentation during an immune response.

5. acrosome reaction during fertilization.

6. Recycling of plasma membrane bound receptors

answer: i feel like it would be 3

explanation: